/ 121 AIR CONSUMPTION MEASUREMENT AVL Air Consumption Meter Along with the fuel consumption, air consumption is another important parameter when developing combustion engines. In emission certification, air consumption is taken as a reference value. Thus, the air consumption is an integral part of AVL testbed solutions. The air consumption measurement system consists of the components of flow meter sensor (measuring tube), supply/evaluation unit and measuring section. The measuring tube is available in six different nominal widths of NW 25 up to NW 200 and is installed in the measuring section using quick release connections. MEASUREMENT PRINCIPLE The system works in accordance with the principle of the hot film anemometer. This measurement procedure is based on the fact that heat is withdrawn from a heated body by the air flowing around it. In the relevant measurement range, this flow-dependent cooling does not depend on pressure and temperature but on the type and number of air particles making contact with the heated surface. Thus, this procedure directly represents the mass flow of the suction air. With this procedure, the measurement value is provided directly in the units of kg/h or the standard m³/h. APPLICATION The combination of high levels of measurement accuracy, a large measurement range and short response times results in the use of air mass measurement in the following fields of application: engine development, quality assurance, emissions development and emissions certification. Different measurement tubes up to 4,000kg/h. BENEFITS AT A GLANCE • The high levels of measurement accuracy across a large measurement range comply with the requirements of automatic engine calibration • The short response time is a precondition for detecting quick engine load changes in the transient measurement range • Simple handling due to modular design and the use of quick release connections facilitates the integration into the test facility
Solutions Katalog 2015_E
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